Red Thread

Pathogen: Laetisaria fuciformis

Identification

Symptoms

  • Pink to red threadlike fungal growth on leaf tips
  • Irregular tan patches
  • Often associated with low nitrogen and cool wet weather
Season
Mar, Apr, May, Jun, Sep, Oct, Nov
Regions
Pacific Northwest, Northeast, Midwest
Turf Hosts
Fine Fescue, Perennial Ryegrass, Kentucky Bluegrass

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This is identification help, not a diagnosis. Symptoms described here can overlap between diseases and other causes (drought, wear, nutrient deficiency). When you're not sure, or before applying any treatment, contact your state's Cooperative Extension office - most offer free or low-cost diagnosis and know your local conditions best.